Maria will have found out:
Catalina was not a nun, but a midwife...or posed as one. She may or may not have taken vows as something akin to a lay sister.
She also may have been married.
She does seem to have had an affair with a Ligero though how involved they were she doesn't know.
It is possible she has killed several children but Maria is hesitant to turn her over to authorities as she promised sanctuary and is not sure the allegations are true.
Diego: AKA (Poncho Gorda or Poncho Gordo)
Maria couldn't learn too much about him apart from the "commercials" he'd make.
He apparently was at least for a time homeless in Mexico City and used to make little tapes on VHS which he'd load up in VCRs at electronic stores, hit play and then run out.
For a time at least he was declaring himself to be the reincarnation of a Poncho Gorda which as far as she can tell was a totally fictitious bandit he made up, and being the feminine tense was equally odd.
He began going after and harassing psychic mediums which he saw as taking advantage of people that had lost loved ones to increasing violence.
Ligero was more or less more well known and was originally a highway patrolman in rural north Mexico. He was well known as he refused to take part in corruption or accept bribes. Gradually though, likely spurred by his partner, his principles started to erode and he became pretty corrupt including attempting to aid in the kidnapping of an official's son. He seems to have had two families with one wife possibly being a prostitute.
He found the body of a young girl murdered by drug dealers and as he later told police, the ghost of his father kept nagging him about the case. When he couldn't get anything done about the murder he sought revenge himself. He was arrested for the execution of several local drug dealers and escaped custody and disappeared for awhile.
He seems to have found his way eventually to Mexico City where he hooked up with Diego and lived on the streets.
Some rumors are that when he disappeared he went south and encountered Tezcatlipoca who absolved him.
(Tezcatlipoca can tempt humans into self-destruction, but when he takes his turkey form he can also cleanse them of contamination, absolve them of guilt, and overcome their fate.)
There are also rumors of Ligero, or Ligero and Diego, having encountered a Cihuateteo.
(in Aztec would refer to the spirit of a woman who died from delivering her child.)
Every so often the death of a drug dealer or cartel member would be attributed to him.